Debian has always be the distro that split the KDE packages. Mandriva might have started to do the same, but to claim that installing Konsole install all of KDE is silly. Are you sure you are using Debian?

I just checked the dependencies of konsole is:
kdelibs, kdebase-runtime and Qt.

So you need the core KDE libraries, the core KDE runtime requirements and Qt to install konsole. You don't get any other KDE applications besides konsole.